Journal of Energy Chemistry ›› 2022, Vol. 69 ›› Issue (6): 356-362.DOI: 10.1016/j.jechem.2022.01.003

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Electrochemically induced phase transition in a nanoflower vanadium tetrasulfide cathode for high-performance zinc-ion batteries

Shizhe Gaoa,1, Peng Jub,1, Ziquan Liua, Lei Zhaia, Wenbao Liua, Xiaoyu Zhanga, Yanli Zhoua, Caifu Donga, Fuyi Jianga,*, Jianchao Suna,*   

  1. aSchool of Environment and Material Engineering, Yantai University, Yantai 264005, Shandong, China;
    bKey Laboratory of Marine Eco-Environmental Science and Technology, Marine Bioresource and Environment Research Center, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, Shandong, China
  • Received:2021-10-31 Revised:2021-12-31 Accepted:2022-01-03 Online:2022-06-15 Published:2022-10-25
  • Contact: * E-mail addresses: fyjiang@ytu.edu.cn (F. Jiang), jianchaoabc@163.com (J. Sun).
  • About author:1 These authors contributed equally to this work.

Abstract: Aqueous zinc-ion batteries (AZIBs) are promising contenders for large-scale energy storage with the mer-its of their low cost, high safety, environmental friendliness, and competitive gravimetric energy density. Nevertheless, suitable cathode materials with long cycle life and adequate capacity are still rare. Herein, we report a nanoflower vanadium tetrasulfide/carbon nanotubes (VS4/CNTs) cathode with high Zn-storage performance. We propose a phase transition reaction mechanism from VS4 to zinc pyrovanadate in the initial cycles and a reversible intercalation mechanism for Zn2+ in zinc pyrovanadate during sub-sequent cycles. As a result, the cathode delivers a high discharge capacity of 265 mAh g-1 at 0.25 A g-1 and 182 mAh g-1 at 7 A g-1. In addition, the cathode exhibits a long-term cyclability with 93% capacity retention over 1200 cycles at 5 A g-1. VS4/CNTs with superior electrochemical performance is a hopeful cathode material in AZIBs.

Key words: Zinc-ion batteries, Vanadium tetrasulfide, Zinc pyrovanadate, Phase transition, Reaction mechanism